Add change tracker entry for disabling download-rustc temporarily

Author: jieyouxu

src/bootstrap/src/utils/change_tracker.rs

@@ -456,4 +456,9 @@ pub const CONFIG_CHANGE_HISTORY: &[ChangeInfo] = &[
         severity: ChangeSeverity::Warning,
         summary: "The default check stage has been changed to 1. It is no longer possible to `x check` with stage 0. All check commands have to be on stage 1+. Bootstrap tools can now also only be checked for the host target.",
     },
+    ChangeInfo {
+        change_id: 143577,
+        severity: ChangeSeverity::Warning,
+        summary: "`download-rustc` has been temporarily disabled for the library profile due to implementation bugs (see #142505).",
+    },
 ];